BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 9878 Comm: syz.0.1973 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 register_lock_class+0x2aa/0x2e0 kernel/locking/lockdep.c:1376
 __lock_acquire+0x10c/0x2de0 kernel/locking/lockdep.c:5162
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 blk_freeze_acquire_lock block/blk.h:766 [inline]
 blk_freeze_queue_start block/blk-mq.c:185 [inline]
 blk_mq_freeze_queue_nomemsave+0xd1/0x120 block/blk-mq.c:206
 blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
 elevator_change+0x194/0x480 block/elevator.c:668
 elevator_set_default+0x375/0x440 block/elevator.c:754
 blk_register_queue+0x3f3/0x4e0 block/blk-sysfs.c:992
 __add_disk+0x6b8/0xdb0 block/genhd.c:531
 add_disk_fwnode+0x100/0x3a0 block/genhd.c:600
 add_disk include/linux/blkdev.h:798 [inline]
 nbd_dev_add+0x733/0xb60 drivers/block/nbd.c:2026
 nbd_genl_connect+0x96c/0x1cd0 drivers/block/nbd.c:2223
 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2575
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1364
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2713
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767
 __sys_sendmsg net/socket.c:2799 [inline]
 __do_sys_sendmsg net/socket.c:2804 [inline]
 __se_sys_sendmsg net/socket.c:2802 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd79cf9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffccb93e338 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd79d225fa0 RCX: 00007fd79cf9e159
RDX: 0000000000000010 RSI: 0000200000001ac0 RDI: 0000000000000004
RBP: 00007fd79d03506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd79d225fac R14: 00007fd79d225fa0 R15: 00007fd79d225fa0
 </TASK>